Drill-steel guide



C. C. HANSEN DRILL STEEL GUIDE Filed Dec. 1.7 a

Patented May 25, 1926.

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CHARLES, C. HANSEN, OF EASTON, PENNSYLVANIA, ASSIGNOE TO INGERSOLL-RAND COMIEANY, OF JEREiEY CITY, NEW JERSEY, A CORPORATION OF NEIV JERSEY.

DRILL-STEEL GUIDE.

Application filed December 1'7, 1925.

This invention relates to rock drills, but more particularly to a drill steel guide for rock drills equipped with a supporting shell.

The object of this invention is to guide the drill steel especially when starting a hole and during the drilling operation so as to prevent the departure of the drill steel from a given course.

Other objects will be in part obvious and in part pointed out hereinafter.

The invention consists of the combinations of elements, features of construction and arrangement of parts having the general mode of operation substantially as hereinafter described and more particularly pointed out in the appended claims and ill-ustrated. in the accompanying drawings, in which Figure 1 is a longitudinal elevation of the front end of a rock drill and its shell showing the manner in which the free end of the drill steel is guided,

Figure 2 is an enlarged detail end view of a guide partly broken away, and

Figure 3 is a sectional view taken through Figure 2 on the line 3-3 looking in the direction of the arrows.

Referring to the drawings, the invention is shown embodied in a rock drill having a front head A, only the front end of which is shown. The rock drill indicated in the drawings may be of the drifter type and is provided with a shell B intended to be secured thereto in the usual manner for advancing the rock drill toward the work and for withdrawing the drill from the work..

A drill steel C adapted to be inserted in the front head A is provided with wings or lugs D which may interlock with the usual chuck parts (not shown) in the front head in a well understood manner for preventing ejection of said drill steel from the front head.

In accordance with the present invention, lugs E are formed on the outer side of the shell B, preferably near the front end thereof, through which lugs are formed holes F for the reception of a pair-of parallel rods G. The rods G are of a length to extend well in advance of the front end of the shell and carry at their forward ends a drill steel guide II. Disposed slidably upon the rods G and between the front end of the shell B and the guide H are. spacers J whereby the spacing of the guide II with respect to the shell B is determined. In this instance the Serial No. 76,110.

ends of the rods G are threaded to receive suitable nuts K for clamping the rods G, the guide II and thespacers J securely in fixed position.

In the present instance the guide H is provided with a cover L which is secured pivotally to the guide H as at O. A slot P is formed in the opposite end of the cover L for the reception of a clamping-bolt Q secured pivotally to the guide H as by means of a pin R.

In order that the guide H and the cover L may at all times be protected against wear which might otherwise be caused by the reciprocatory and rotative action of the drill steel C, said guide and cover are provided With a smooth bore S of suflicient area to receive semi-circular bushings T which, when the cover L is clamped against the guide H, will form a continuous bearing for the drill steel C forwardly of the rock drill. The bushings T in this instance are provided with hollow lugs V which extend into recesses of the cover IJ and the guide II. The bushings are preferably secured in position by means of bolts X which extend through suitable holes Y formed in the guide H, the cover L, and in the ends of the lugs V of the bushings.

By means of this invention the front or free end of the drill steel may at all times be held co-axial with the rock drill, so that when the bit end of the steel encounters a hard seam or crevice in the rock, it will be held against departure from the desired course. This is particularly advantageous in drilling operations wherein it is essential that the holes be drilled parallel to each other.

I claim:

1. In combination with a rock drill and a supporting shell therefor, a drill steel in the rock drill, of a guide carried by the shell and forming a continuous bearing for the drill steel to prevent misalignment of y the drill steel with respect to the rock drill, said guide being secured fixedly to the shell.

2. In combination with a rock drill and a supporting shell therefor, a drill steel in the rock drill, of rods secured fixedly to the shell and extending in advance thereof, and a guide secured fixedly on said rods forming a continuous bearing for the drill steel for holding said drill steel co-axial with the rock drill.

3. In combination With a rock drill and a supporting shell therefor, a drill steel in the rock drill, 01": a pair of rods secured fixedly at one end to the front end of the rock drill shell and extending in advance thereof said rods being parallel throughout their length, and a guide on the free ends of said rods having a smooth bore forming a continuous bearing for the drill steel for holding the free ,end of said drill steel coaxial with the rock drill.

4. In combination With a rock drill and a supporting shell therefor, a drill steel in the rock drill, of a pair of parallel rods secured fixedly at one end to the exterior of 1 

